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Chapter 16

Chapter 16. Just-In-Time Systems. JIT/Lean Production. Just-in-time : Repetitive production system in which processing and movement of materials and goods occur just as they are needed, usually in small batches JIT is characteristic of lean production systems

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Chapter 16

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  1. Chapter 16 Just-In-Time Systems

  2. JIT/Lean Production • Just-in-time: Repetitive production system in which processing and movement of materials and goods occur just as they are needed, usually in small batches • JIT is characteristic of lean production systems • JIT operates with very little “fat”

  3. JIT Goals • Eliminate disruptions • Make system flexible by reduce setup and lead times • Eliminate waste, especially excess inventory

  4. Sources of Waste • Overproduction • Waiting time • Unnecessary transportation • Processing waste • Inefficient work methods • Product defects

  5. Big vs. Little JIT • Big JIT – broad focus • Vendor relations • Human relations • Technology management • Materials and inventory management • Little JIT – narrow focus • Scheduling materials • Scheduling services of production

  6. JIT Building Blocks • 1. Product design • 2. Process design • 3. Personnel/organizationalelements • 4. Manufacturing planning and control

  7. 1. Product Design • Standard parts • Modular design • Highly capable production systems

  8. 2. Process Design • Small lot sizes • Setup time reduction • Manufacturing cells • Limited work in process • Quality improvement • Production flexibility • Little inventory storage

  9. Reduces inventory Less rework Less storage space Problems are more apparent Increases product flexibility Easier to balance operations Benefits of Small Lot Sizes

  10. Production Flexibility • Reduce downtime by reducing changeover time • Use preventive maintenance to reduce breakdowns • Cross-train workers to help clear bottlenecks • Reserve capacity for important customers

  11. 3. Personnel/Organizational Elements • Workers as assets • Cross-trained workers • Continuous improvement • Cost accounting • Leadership/project management

  12. 4. Manufacturing Planning and Control • Level loading • Pull systems • Visual systems • Close vendor relationships • Reduced transaction processing • Preventive maintenance

  13. Pull/Push Systems • Pull system: System for moving work where a workstation pulls output from the preceding station as needed. (e.g. Kanban) • Push system: System for moving work where output is pushed to the next station as it is completed

  14. Kanban Production Control System • Kanban: Card or other device that communicates demand for work or materials from the preceding station • Kanban is the Japanese word meaning “signal” or “visible record” • Paperless production control system • Authority to pull, or produce comes from a downstream process.

  15. Buyer Supplier Supplier Supplier Supplier Supplier Supplier Suppiler Traditional Supplier Network

  16. Buyer First Tier Supplier Supplier Supplier Supplier Second Tier Supplier Third Tier Supplier Supplier Supplier Supplier Supplier Tiered Supplier Network

  17. Ultimate Goal A balanced rapid flow Supporting Goals Reduce setup and lead times Eliminate waste Minimize inventories Eliminate disruptions Make the system flexible Building Blocks Product Design Process Design Personnel Elements Manufactur-ing Planning Summary JIT Goals and Building Blocks

  18. Converting to a JIT System • Get top management commitment • Decide which parts need most effort • Obtain support of workers • Start by trying to reduce setup times • Gradually convert operations • Convert suppliers to JIT • Prepare for obstacles

  19. Obstacles to Conversion • Management may not be committed • Workers/management may not be cooperative • Suppliers may resist

  20. JIT in Service The basic goal of the demand flow technology in the service organization is to provide optimum response to the customer with the highest quality service and lowest possible cost. • Eliminate disruptions • Make system flexible • Reduce setup and lead times • Eliminate waste • Minimize WIP • Simplify the process

  21. JIT Purchasing • New challenges • Meeting manufacturing requirements • Changing from traditional thinking and practices – frequent on-time delivery of small quantities • Long term relationships with suppliers as partners • How about Exchange purchasing: Auctions?

  22. JIT II • JIT II: the practice of allowing vendors to manage some aspects of buying their products or services for the buyer

  23. Benefits of JIT Systems • Reduced inventory levels • High quality • Flexibility • Reduced lead times • Increased productivity

  24. Benefits of JIT Systems (cont’d) • Increased equipment utilization • Reduced scrap and rework • Reduced space requirements • Pressure for good vendor relationships • Reduced need for indirect labor

  25. Elements of JIT • Smooth flow of work (the ultimate goal) • Elimination of waste • Continuous improvement • Eliminating anything that does not add value • Simple systems that are easy to manage • Use of product layouts to minimize moving materials and parts • Quality at the source

  26. Elements of JIT (cont’d) • Poka-yoke – fail safe tools and methods • Preventative maintenance • Good housekeeping • Set-up time reduction • Cross-trained employees • A pull system

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